\(Sc\, (Z = 21)\) is a transition element but \(Zn\, (Z = 30)\) is not because

A both \(Sc^{3+}\) and \(Zn^{2+}\) ions are colourless and form white compounds.
B in case of \(Sc, 3d\) orbitals are partially filled but in \(Zn\) these are filled.
C last electron is assumed to be added to \(4s\) level in case of \(Zn.\)
D both \(Sc\) and \(Zn\) do not exhibit variable oxidation states.

Verified Solution

Answer & Solution

Correct Answer

(B) in case of \(Sc, 3d\) orbitals are partially filled but in \(Zn\) these are filled.

Step-by-step Solution

Detailed explanation

Transition element are those in which second last shell is in completely filled. In \(S{c}\), the \(e^{-}\) configuration is \(3 d^{1} 4 s^{2}\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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